001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.component.http.helper;
018    
019    import java.io.ByteArrayInputStream;
020    import java.io.ByteArrayOutputStream;
021    
022    /**
023     * Subclass of ByteArrayOutputStream that allows creation of a
024     * ByteArrayInputStream directly without creating a copy of the byte[].
025     *
026     * Also, on "toByteArray()" it truncates it's buffer to the current size
027     * and returns the new buffer directly.  Multiple calls to toByteArray()
028     * will return the exact same byte[] unless a write is called in between.
029     *
030     * Note: once the InputStream is created, the output stream should
031     * no longer be used.  In particular, make sure not to call reset()
032     * and then write as that may overwrite the data that the InputStream
033     * is using.
034     */
035    public class LoadingByteArrayOutputStream extends ByteArrayOutputStream {
036    
037        public LoadingByteArrayOutputStream() {
038            super(1024);
039        }
040    
041        public LoadingByteArrayOutputStream(int size) {
042            super(size);
043        }
044    
045        public ByteArrayInputStream createInputStream() {
046            return new ByteArrayInputStream(buf, 0, count);
047        }
048    
049        public byte[] toByteArray() {
050            if (count != buf.length) {
051                buf = super.toByteArray();
052            }
053            return buf;
054        }
055    }